{"id":54102,"date":"2019-12-18T00:00:00","date_gmt":"2019-12-17T21:00:00","guid":{"rendered":"https:\/\/prohoster.info\/blog\/blog_prohoster\/ispolzovanie-pohozhih-unicode-simvolov-dlya-obhoda-autentifikatsii"},"modified":"2020-02-18T14:02:04","modified_gmt":"2020-02-18T11:02:04","slug":"ispolzovanie-pohozhih-unicode-simvolov-dlya-obhoda-autentifikatsii","status":"publish","type":"post","link":"https:\/\/prohoster.info\/ro\/blog\/news\/ispolzovanie-pohozhih-unicode-simvolov-dlya-obhoda-autentifikatsii","title":{"rendered":"Utilizarea unor simboluri Unicode similare pentru a ocoli autentificarea","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

GitHub s-a dovedit<\/a><\/noindex> este vulnerabil la atacuri care permit capturarea accesului la cont prin manipularea simbolurilor Unicode \u00een email. Problema este c\u0103 unele simboluri Unicode, atunci c\u00e2nd sunt aplicate func\u021biilor de conversie \u00een litere mici sau mari, sunt traduse \u00een simboluri obi\u0219nuite, asem\u0103n\u0103toare (c\u00e2nd mai multe simboluri diferite sunt traduse \u00eentr-un singur simbol \u2014 de exemplu, simbolul turcesc «ı» \u0219i «i» c\u00e2nd sunt aduse la forma de mari devin «I»).<\/p>\n

\u00cenainte de a verifica parametrii de conectare \u00een unele servicii \u0219i aplica\u021bii, datele trimise de utilizator sunt mai \u00eent\u00e2i transformate \u00een litere mari sau mici \u0219i apoi verificate \u00een baza de date. Dac\u0103 serviciul permite utilizarea simbolurilor unicode \u00een numele de utilizator sau email, atacatorul poate folosi simboluri unicode asem\u0103n\u0103toare pentru a efectua un atac care manipuleaz\u0103 coliziunile \u00een tabelele de conversie a literelor (Coliziuni de mapare a cazurilor Unicode). <\/p>\n

‘ß’.toUpperCase() == ‘ss’.toUpperCase() \\\/\\\/ 0x0131
\n ‘K’.toLowerCase() == ‘K’.toLowerCase() \\\/\\\/ 0x212A
\n ‘John@Gıthub.com’.toUpperCase() == ‘John@Github.com’.toUpperCase()<\/p>\n

Pe GitHub, atacatorul a putut<\/a><\/noindex> prin intermediul formularului de recuperare a parolei uitate s\u0103 ini\u021bieze trimiterea unui cod de recuperare pe un alt email prin indicarea \u00een formular a unei adrese care include un simbol unicode, provoc\u00e2nd o coliziune (de exemplu, \u00een loc de mike@example.org, se utiliza email-ul mı<\/b>ke@example.org). Adresa a trecut verificarea deoarece a fost transformat\u0103 \u00een litere mari \u0219i se potrivea cu adresa original\u0103 (mike@example.org), dar la trimiterea email-ului a fost inserat\u0103 ca atare, iar codul de recuperare a fost trimis pe adresa fals\u0103 (mı<\/b>ke@example.org).<\/p>\n

Unele dintre simbolurile<\/a><\/noindex>, care provoac\u0103 coliziuni la conversia literelor:<\/p>\n

ß \t0x00DF \tSS
\n ı \t0x0131 \tI
\n ſ \t0x017F \tS
\n ff \t0xFB00 \tFF
\n fi \t0xFB01 \tFI
\n fl \t0xFB02 \tFL
\n ffi \t0xFB03 \tFFI
\n ffl \t0xFB04 \tFFL
\n ſt \t0xFB05 \tST
\n st \t0xFB06 \tST
\n K \t0x212A \tk<\/p>\n

<\/a><\/noindex><\/p>\n

Sursa: opennet.ro<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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